Call the number of trumpet players "T" and the number of horn players "H".
We can use the given information to set up equations:
1."<span>the number of trumpet players is 4 times the number of French horn players"

2. "</span><span>There are 35 trumpet and French horn players in the band."

If you were asked to solve you could now do it by substitution:






</span>
M = 3
Is that what you were looking for?
R = ((3V)/((pi)(h^2))+h)/3
7/8=x/48
x=(7/8)48
x=(7)(48/8)
x=(7)(6)
x=42
D.42